At the staid Marcia Blaine School for Girls, in Edinburgh, Scotland, teacher extraordinaire Miss Jean Brodie is unmistakably, and outspokenly, in her prime. She is passionate in the application of her unorthodox teaching methods, in her attraction to the married art master, Teddy Lloyd, in her affair with the bachelor music master, Gordon Lowther, and—most important—in her dedication to "her girls," the students she selects to be her crème de la crème. Fanatically devoted, each member of the Brodie set—Eunice, Jenny, Mary, Monica, Rose, and Sandy—is "famous for something," and Miss Brodie strives to bring out the best in each one. Determined to instill in them independence, passion, and ambition, Miss Brodie advises her girls, "Safety does not come first. Goodness, Truth, and Beauty come first. Follow me." And they do. But one of them will betray her.

"Think about the woman you’re becoming!" Leonie said, trying to prevent Cassie’s flight from home and the problems there. "You could find yourself out of the frying pan and into the fire." Her past denied and dance championship dreams discarded, Cassie Sleight leaves home. In the seemingly idyllic coastal town of Keimera, she starts a career on the English staff of the local high school. Exposure to Mark Talbut, a man struggling to be modern yet threatened by power shifts in the workplace and in society, causes Cassie to assess her reactions as a teacher and a woman. As she does so, the secrets of her past surface. Will that past continue to choreograph Cassie’s present steps? What sort of woman does she become?

In and Out of Step looks at how the world a person lives in shapes that person for good and for bad. It is a story about friendship and family, belonging, alienation, sexual harassment, and change. The title alludes to the way Cassie Sleight uses dance as a way to interpret life and process her reactions to it.